Trailblazer radio not working properly and door chime not working

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This usually doesn't work the way you think it does. The factory radio are controlled and monitored by the Body Control Module. Things like warning chimes and the clicker for the turn signals are supplied by the BCM and factory amplifier and played via the radio. You are likely to get strange issues. You can try an integration harness for fun.

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You can't disable it , sound comes from the radio out of driver door speaker . The BCM - body control module sends this signal to the radio on serial data bus . A faulty input signal to BCM - door ajar switch probably . You need to take it to a qualified repair shop .

I believe the chime may be tied into the radio, since the chime is heard through the drivers door speaker. Did you replace the factory radio? That may have caused it. Or if the factory radio isn't working it could be that.

brown wire is memory reconnect it with yellow also

No separate fuse for the chimes, runs on direct battery power as a safety measure. Only way to disable it is to find the "chime box" and unplug it. Usually under the glove box area.

Is the door chime working and you want to disable it or is there no chime at all?First off the door chime comes through the radio speaker,if you need to disable it you will need to cut the wire from the speaker to the chime.If is annoying you can spray foam on it and muffle it .I believe that it uses data bits from the head unit (radio) to function so another way to get rid of it is sort of drastic but change out your head unit.Sorry your question only asked about where the fuse is and to the best of my knowledge is that is is none.

Do the interior lights come on when door is open? If not, you need to check driver's door jamb switch. The driver's door control module could also be the problem. If the interior light do come on, then I would suspect the ignition switch.
You haven't changed out the radio recently? All chimes go thru the radio.

Check the radio fuse. As unusual as it seems, GM has started having the radio (even though not turned on) generate the chimes and turn signal sounds. If the radio fails, all the chimes fail too.

This applies to other vehicles besides the HHR. My 2003 Silverado had the door chimes fade down so I could barely hear them. The fix was to replace the radio (under warranty, fortunately...).

The door sensor needs adjusting. It may be loose.
Loosen the lock nut on the pushbutton sensor in the door frame.
Unscrew the sensor a little and re-tighten the lock nut.